Cutting-torch.



E. H. SMITH.

CUTTING TORCH. APPLICATION FILED JAN. 22, 1914.

1,]. 36 4900 Patented Apr. 20, 1915.

UNITED STATES PATENT OFFICE.

Specification of Letters Patent Application filed January 22, 1914. Serial No. 813,664.-

To all 'tvhom it may concern l3e 1t known that I, ELMER H. SMITH, citizen of the United States, resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Cutting-Torches, of whichthe following is a specification.

My invention relates to oxy-acetylene torches for cutting metal and the object of the invention is to provide a cutting nozzle by means of which the metal can be severed or a hole cut therein with great accuracy and despatch and without destroying more metal than is actually'necessary in performing the operation desired. v

p A further object is to so concentrate the heat of the preheating flame that considerof the torch.

able time and labor will be saved in the use The invention consists generally in vari- .ous constructions and combinations, all as herelnafter described and particularly po1nt-' ed out in the claims.

transverse sectional View on the line wa2 of Fig.2.

In the drawing; 2 represents the handle portion of the torch, having suitable couplings 3 and 3 for attachment with a source of oxygen and acetylene gas supply, not shown. Pipes 4 and 5 communicate through the handle 2 with the oxygen and acetylene gas supply, and a coupling 6 communicates with the pipes 4 and 5 and has a mixing chamber 7 wherein the oxygen and acetylene gas are'mingled on their wayto the torch nozzle. The nozzle 8 has a bracket 9 thereon provided with a passage 10 which communicates with the mixing chamber 7 and said nozzle is interiorly threaded to receive a plug 11 having a flange 12 that is seated on the end wall of the nozzle 8 and pro vided with an annular passage 13 which communicates with the oxygen and acetylene gas duct 10. The nozzle 8 is cone-shaped and a passage 14, conical in form, communi-v cates with the annular passage 13 and extends vto the tip of the nozzle, gradually acetylene gas toward the contracted exit of the nozzle to concentrate the pressure or flow of the ox gen and gas at this point. This will be due to the fact that the area of the passage 14 gradually decreases and, consequently, as the gas approaches the outlet of thenozzle, it will'flow with a greater degree of velocity and concentrate the flame at the point where the oxygen jet strikes the metal. The tip of the plug and nozzle is preferably made concave, having surfaces. 15 at right angles substantially to the Walls of the passage 14 and thereby the flow of gas will not be retarded, and there will be no danger of a flare-back into the torch. The flame projected from this nozzle will be circular and will be adapted to pro-heat the metalto be cut or consumed. The plug 11 is provided with a duct 16 that is concentric with the passage 14 and has converging walls which are adapted to concentrate and intensify the force of the gas and deliver it in the form of a circular jet into the space within the circular preheating flame.

The duct 16 is arranged to direct the oxygen into the apex of the cone formed by the acetylene flame. A tube 17 communicates with the duct 16 and is provided with a valve 18 having a lever 19 by means of which the operator can instantly regulate the flow of pure oxygen to the nozzle. The pipe 17 communicates through the hand grip 2 with a source of pure oxygen supply. The.

torch-may be moved easily and quickly over the surface to be cut and at all times will be absolutely Within the control of the user, whocan easily and quickly regulate the delivery of the oxygen jet by the operation of the lever 19. The oxygen is entirely inclosed by the preheating jet and concentric therewith. There is, therefore, but little Patented Apr. 20, 11915.

opportunity for even an unskilled operator to out an irregular opening or one that is larger than necessaryin the metal through his inability or inexperience in handling the torch. The preheating flame islcone shaped in form and the cutting jet is 0 arranged that it contacts with the metal at the center of the preheating flame and will rapidly and neatly cut through the metal as the torch is movedlthereon. I

.I claim as my invention:

1. An oxy-acetylene cutting torch comprising a nozzle having a cone-shaped recess therein extending to the tip of the nozzle, a plug fitting within said nozzle and having v thereof to form a passage leading from said recess to said tip, said plug having a duct therein communicating with a source of pure oxygensupply and, extending through the tip end of said plug and encircled by the passage between said plug and nozzle at the tip thereof.

2. A cutting torch comprising a nozzle having a cone-shaped recess therein, a plug fitting within said nozzle and having a tapered end to enter said recess, the tip end of said nozzle and said plug being concentric and in alinement substantially with one "another, said plug having an annular passage communicating with a source of oxygen and acetylene supply, a cone-shaped passage being formed between the tapered end 0 said plug and said nozzle communicating with said annular passage and leading to the tips of said nozzle and plug, said plug also having a passage therein for the pure "passage in said through the duct in said plug.

the exit end of the oxygen plug being encircled by the exit of the passage between said plug and nozzle.

3. A cutting torch comprising a nozzle having a tapered end and a correspondingly tapered recess therein, a plug fitting within said nozzle and having a tapered end to enter said recess and spaced from the walls thereof to form a passage encircling the tapered end of said plug, the tip end of said nozzle and said plug being concave and the conical end of said plug having a passage therethrough for the pure oxygen supply, the passage between said plug and nozzle oxygen s p y communicating with a source of oxygenacetylene gas supply to form a circular preheating flame at the tip. of said nozzle, the oxygen for the cuttingfiame being supplied In witness whereof, I have ELMER H. MITH. Witnesses:

GENEVIEVE E. SORENSEN,

EDWARD A. PAUL.

hereunto set f my hand this 14th day of J anuar 1914. 

